Thickness-dependent flat band potential of anatase TiO2(001) epitaxial films on Nb:SrTiO3(001) investigated by UHV-electrochemistry approach

Yuji Matsumoto, Yoshihiro Miura, Shintaro Takata

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The semiconductor characteristics of anatase TiO2(001) films, which were pulsed laser-deposited on a 0.05 wt % Nb-doped SrTiO3(001) single crystal electrode, as well as the film/electrolyte heterointerfaces were investigated by the ultrahigh-vacuum electrochemistry approach. In addition to the current-voltage measurements, equivalent circuit modeling in electrochemical impedance spectroscopy at different electrode potentials reveals that the flat band potential of anatase TiO2 films shifts by +0.5 V when the film thickness increases with (1 × 4) surface reconstruction more visible in reflection high energy electron diffraction. The possible origins of the observed flat band potential shift will be discussed from the viewpoint of electric double layer effects, mainly of donor-type surface states and surface reconstruction, compared with the results of single crystal rutile TiO2(110).

Original languageEnglish
Pages (from-to)1472-1477
Number of pages6
JournalJournal of Physical Chemistry C
Volume120
Issue number3
DOIs
Publication statusPublished - 2016 Jan 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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